MATHEMATICS
A 20hp, 230V, 1150rpm 4-pole, DC shunt motor has 620 conductors and the armature circuit resistance is 0.2Ω. When it delivers rated power at rated speed, it draws a line current of 74.8A and a field current of 3A. Calculate:
i) The torque developed
ii) The rotational losses
iii) Total losses
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